WO2016201713A1 - 背光模组和包含其的液晶显示装置 - Google Patents

背光模组和包含其的液晶显示装置 Download PDF

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Publication number
WO2016201713A1
WO2016201713A1 PCT/CN2015/082280 CN2015082280W WO2016201713A1 WO 2016201713 A1 WO2016201713 A1 WO 2016201713A1 CN 2015082280 W CN2015082280 W CN 2015082280W WO 2016201713 A1 WO2016201713 A1 WO 2016201713A1
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WO
WIPO (PCT)
Prior art keywords
disposed
light guide
guide plate
backlight module
liquid crystal
Prior art date
Application number
PCT/CN2015/082280
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English (en)
French (fr)
Inventor
李德华
Original Assignee
深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US14/778,243 priority Critical patent/US9885823B2/en
Publication of WO2016201713A1 publication Critical patent/WO2016201713A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/04—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/06—Controlling the distribution of the light emitted by adjustment of elements by movement of refractors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0063—Means for improving the coupling-out of light from the light guide for extracting light out both the major surfaces of the light guide

Definitions

  • the present invention relates to the field of liquid crystal display production technologies, and in particular, to a backlight module and a liquid crystal display device including the same.
  • liquid crystal displays As a very common display, liquid crystal displays have advantages such as low power consumption, small size, light weight, ultra-thin and many other displays, and the field of application is more and more extensive. And how to make LCD monitors provide more and better humanized functions has become a novel highlight of LCD monitors.
  • the present invention provides a backlight module and a liquid crystal display device including the same.
  • the backlight module can provide a light source for the liquid crystal glass of the liquid crystal display device, and can also be used as an illumination source in daily life, so that the backlight module can improve the application range and meet the different needs of users.
  • the backlight module has a simple structure and is easy to implement.
  • a backlight module is provided.
  • the backlight module is an edge light type, and includes a back plate, a light guide plate disposed in the back plate, an optical film, a reflection sheet, and a position conversion mechanism. a position conversion mechanism for aligning the position of the optical film and the reflective sheet such that the optical film is located at one of the front and back surfaces of the light guide plate and the reflective sheet is located at the front and back surfaces of the light guide plate At the office.
  • the position conversion mechanism includes a roller assembly coupled to the backing plate, and the two sides of the optical film and the two sides of the reflective sheet are fixedly coupled to form a drive sleeve, and the drive sleeve is wound around the roller assembly.
  • the roller assembly includes a support member, a support shaft and a bearing, the support member is fixedly disposed on the back plate, and a side hole of the support member away from the light guide plate is provided with a normal circular hole and is in a circular hole A groove is provided in the axially vertical direction, the support shaft is disposed in the circular hole, the bearing is disposed in the groove, and is fixed on the support shaft.
  • the bearings are multiple, the number of slots matches the number of bearings, and the width of the slots matches the width of the bearings.
  • the outer circumferential wall of the bearing is provided with a flexible material.
  • the roller assembly is symmetrically disposed on both sides of the drive sleeve.
  • the backlight module further includes a light source disposed on a light incident side of the light guide plate, the roller assembly and the light source are disposed away from the light guide plate in sequence, and a position for adjusting the drive sleeve is disposed on a side of the back surface of the light guide plate. Adjustment wheel assembly.
  • the backing plate is configured in a frame shape and a glass plate is disposed between the backing plate and the light guiding plate.
  • a reflector is disposed on a side of the back surface of the backing plate.
  • a liquid crystal display device comprising the above backlight module is provided.
  • the invention has the advantages that the backlight module can provide a light source for the liquid crystal glass of the liquid crystal display device as well as the light source by adjusting the positions of the optical film and the reflection sheet according to different needs of the user.
  • the generated light is leaked from the back side of the backlight module for general illumination. Therefore, the backlight module expands the use range of the liquid crystal display device, and provides more humanized services for the user.
  • the backlight module realizes position conversion of the optical film and the reflection sheet through the roller assembly, and has a simple structure and is easy to implement.
  • FIG. 1 shows a cross-sectional view of a liquid crystal display device in accordance with a first embodiment of the present invention
  • Figure 2 shows an enlarged view from A of Figure 1;
  • Figure 3 is a cross-sectional view showing a liquid crystal display device in accordance with a second embodiment of the present invention.
  • Figure 4 shows an enlarged view from B of Figure 3;
  • Figure 5 shows a liquid crystal display device in accordance with the present invention
  • Figure 6 shows an optical path diagram of a reflector according to the present invention
  • Figure 7 shows a structural view of a roller assembly in accordance with the present invention.
  • FIG. 1 shows the structure of a liquid crystal display device 200.
  • the liquid crystal display device 200 includes a backlight module 100 .
  • the backlight module 100 includes a back plate 15, a light guide plate 1, a light source 2, an optical film 3, a reflection sheet 4, and a position conversion mechanism 6.
  • the backlight module 100 is of the side light type, that is, the light source 2 is disposed on the side of the light guide plate 1 .
  • the light guide plate 1 is disposed inside the back plate 15. In order to efficiently illuminate the light emitted from the light source 2 on the liquid crystal glass 20 of the liquid crystal display device 200, the front surface of the light guide plate 1 is covered with the optical film 3.
  • a reflection sheet 4 is provided on the back surface of the light guide plate 1.
  • the position of the optical film 3 and the reflection sheet 4 can be interchanged by the position conversion mechanism 6, so that the optical film 3 is located at one position at the front surface and the back surface of the light guide plate 1, and the reflection sheet 4 Located at the front surface and the back surface of the light guide plate 1 at another point.
  • front surface and the back surface are referred to in the actual use orientation of the liquid crystal display device 200.
  • the optical film 3 is on the front surface of the light guide plate 1, and the reflection sheet 4 is on the back surface of the light guide plate 1, the light emitted from the light source 2 and the light reflected by the reflection sheet 4 are finally directed by the optical film 3
  • the front surface direction is irradiated to supply high-efficiency light to the liquid crystal glass 20 of the liquid crystal display device 200.
  • the light source 2 emits The light and the light reflected by the reflection sheet 4 are finally irradiated by the optical film 3 toward the back surface for daily illumination, instead of supplying light to the liquid crystal glass 20.
  • the light source 2 can be a light emitting diode (LED). Since LED as a light source has high efficiency, low energy consumption, and high color purity, the light supplied in this way can be an ideal illumination light for users to use in daily life. Therefore, the backlight module 100 can not only supply light to the liquid crystal glass 20, but also can be used as a light source for normal illumination, thereby increasing the use range of the backlight module 100, and achieving multi-purpose use of the machine.
  • LED light emitting diode
  • both sides of the optical film 3 and the two sides of the reflection sheet 4 are fixedly connected to form the transmission sleeve 5, that is, the end portions of the optical film 3 and the reflection sheet 4 are sequentially connected to form a sleeve-shaped transmission sleeve 5.
  • the position conversion mechanism 6 includes a roller assembly. The roller assembly is used to drive the drive sleeve 5 to achieve positional interchange of the optical diaphragm 3 and the reflective sheet 4.
  • the roller assembly includes a support member 7, a support shaft 8, and a bearing 9, as shown in FIG.
  • the support member 7 is configured in an elongated shape, and both ends thereof are fixedly connected to the back plate 15 .
  • a normal circular hole 10 is provided on one side edge of the support member 7, and a groove 11 is provided in a direction perpendicular to the axial direction of the circular hole 10.
  • the support shaft 8 can be disposed within the circular hole 10.
  • the bearing 9 can be disposed in the groove 11 and fixed to the support shaft 8.
  • the drive sleeve 5 can contact the bearing 9 to move around the roller assembly.
  • the bearing 9 is plural, the number of slots 11 matches the number of bearings 9, and the width of the slots 11 matches the width of the bearing 9.
  • the support shaft 8 is decomposed into a plurality of shorter support shafts, preventing the support shaft 8 from being easily bent due to the large span.
  • this method ensures the smoothness of the optical film 3 and the reflection sheet 4 during the positional interchange transmission.
  • the outer peripheral wall of the bearing 9 is provided with a flexible material.
  • the flexible material is one of rubber, resin or foamed plastic.
  • the position conversion mechanism 6 is symmetrically disposed on both sides of the transmission sleeve 5. That is, a pair of position conversion mechanisms 6 symmetrically distributed are provided on both sides of the light guide plate 1. This arrangement makes the operation of the transmission sleeve 5 smoother, and the conversion efficiency of the optical film 3 and the reflection sheet 4 is higher, as shown in Figs.
  • the light source 2 may be symmetrically located on both sides of the light guide plate 1.
  • the position conversion mechanism 6 may be disposed on the same side as the light incident side of the light source 2, and the position conversion mechanism 6 is away from the light guide plate 1 with respect to the light source 2, as shown in FIGS.
  • an adjustment wheel assembly 12 may be provided, which is disposed on the back surface side of the light guide plate 1 and is located near the light guide plate 1. The side is for defining the position of the drive sleeve 5 so as to be close to the light guide plate 1 and parallel to the back surface of the light guide plate 1.
  • the adjustment wheel assembly 12 can be configured as a rotating member that is fixedly coupled to the backing plate 15.
  • the adjustment wheel assembly 12 can also be constructed in the same structural form as the roller assembly. Regarding the specific structure of the adjustment wheel assembly 12, details are not described herein again.
  • the position conversion mechanism 6 may also be disposed on the non-light-in side of the light source 2, as shown in FIGS.
  • the drive sleeve 5 does not have to bypass the light source 2.
  • this arrangement facilitates the thinning of the backlight module 100.
  • the light source 2 is generally located on the left and right sides of the shorter side of the widescreen liquid crystal display device 200, rather than the upper and lower sides of the longer side, so that the position conversion mechanism 6 is disposed in the backlight module 100.
  • the light entrance side increases the length of the support shaft 8, thereby increasing the production cost.
  • the backlight module 100 further includes a reflector 13 disposed on a side of the back surface of the light guide plate 1.
  • the reflector 13 is fixedly coupled to the backing plate 15 and includes a flat plate 14 at an angle to the plane in which the backing plate 15 is located.
  • the light emitted by the light source 2 reaches the flat plate 14, and is reflected by the flat plate 14 to obtain illumination light (the arrow indicates the direction of the light).
  • the angle and mounting position of the flat plate 14 and the back plate 15 may vary according to the demand for light.
  • the back plate 15 is configured in a frame shape, and a light transmissive glass 18 is disposed at the back plate 15, as shown in FIG.
  • This light transmissive glass 18 also functions as a member (for example, the reflection sheet 4) that protects the front side of the back sheet 15.
  • the liquid crystal display device 200 further includes a liquid crystal glass 20 disposed on a front surface of the backlight module 100.
  • the liquid crystal glass 20 is located between the front frame 16 and the bezel 17.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

提供一种背光模组（100）和液晶显示装置（200）。背光模组（100）包括背板（15）、设置在背板（15）内的导光板（1）、光学膜片（3）、反射片（4）和位置转换机构（6），位置转换机构（6）用于使光学膜片（3）和反射片（4）位置互换以使得光学膜片（3）位于导光板（1）的前表面和背表面处的一处而反射片（4）位于导光板（1）的前表面和背表面处的另一处。背光模组（100）扩大了液晶显示装置（200）的使用范围。

Description

背光模组和包含其的液晶显示装置
相关申请的交叉引用
本申请要求享有于2015年06月18日提交的名称为“背光模组和包含其的液晶显示装置”的中国专利申请CN201510338171.X的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明涉及液晶显示器生产技术领域，尤其是涉及一种背光模组和包含其的液晶显示装置。
背景技术
液晶显示器作为非常普遍的显示器，其具有功耗低、体积小、重量轻、超薄等许多其他显示器无法比拟的优点，应用的领域也越来越广泛。并且如何让液晶显示器提供更多更好的人性化功能也已经成为液晶显示器的新颖的亮点。
然而现有技术中的液晶显示器的性能还比较单一，并不能满足日益增长的用户对功能多样化的需求。
由此，需要提出一种液晶显示器以能提供更多的人性化的功能。
发明内容
针对现有技术中所存在的上述技术问题，本发明提出了一种背光模组和包含其的液晶显示装置。该背光模组既能为液晶显示装置的液晶玻璃提供光源，也能作为日常生活中的照明光源，从而该背光模组提高了应用范围，满足了用户的不同需求。另外，该背光模组结构简单，易于实现。
根据本发明的一方面，提出了一种背光模组，背光模组为侧光式，其包括背板、设置在背板内的导光板、光学膜片、反射片和位置转换机构，其中，位置转换机构用于使光学膜片和反射片位置互换以使得光学膜片位于述导光板的前表面和背表面处的一处而反射片位于导光板的前表面和背表面处的另一处。
在一个实施例中，位置转换机构包括与背板连接的滚轮组件，并且光学膜片的两侧和反射片的两侧固定连接形成传动套，传动套绕在滚轮组件上。
在一个实施例中，滚轮组件包括支撑件、支撑轴和轴承，支撑件固定设置在背板上，并且支撑件的远离导光板的一侧边缘上设置有通常的圆孔，并在与圆孔的轴向垂直的方向上设置有槽，支撑轴设置在圆孔内，轴承设置在槽内，并固定在支撑轴上。
在一个实施例中，轴承为多个，槽的数量与轴承的数量匹配，并且槽的宽度和轴承的宽度匹配。
在一个实施例中，轴承的周向外壁上设置有柔性材料。
在一个实施例中，在传动套的两侧对称式设置滚轮组件。
在一个实施例中，背光模组还包括设置在导光板的入光侧的光源，滚轮组件和光源依次远离导光板设置，并且，在与导光板的背表面侧设置用于调整传动套的位置的调整轮组件。
在一个实施例中，背板构造为框状，并在背板和导光板之间设置玻璃板。
在一个实施例中，在背板的背表面一侧设置有反射架。
根据本发明的第二方面，提供一种液晶显示装置，包括上述的背光模组。
与现有技术相比，本发明的优点在于，根据用户的不同需求，通过调整光学膜片和反射片的位置，该背光模组既能为液晶显示装置的液晶玻璃提供光源，也能使光源产生的光由背光模组的背面泄露出来而用于普通照明。由此，该背光模组扩大了液晶显示装置的使用范围，为用户提供了更多的人性化服务。另外，该背光模组通过滚轮组件来实现光学膜片和反射片的位置转换，本身结构简单，易于实现。
附图说明
下面将结合附图来对本发明的优选实施例进行详细地描述，在图中：
图1显示了根据本发明的第一实施例的液晶显示装置的截面图；
图2显示了来自图1的A处的放大图；
图3显示了根据本发明的第二实施例的液晶显示装置的截面图；
图4显示了来自图3的B处的放大图；
图5显示了根据本发明的液晶显示装置；
图6显示了根据本发明的反射架的光路图；
图7显示了根据本发明的滚轮组件的结构图；
在附图中，相同的部件使用相同的附图标记，附图并未按照实际的比例绘制。
具体实施方式
下面将结合附图对本发明做进一步说明。
图1显示了液晶显示装置200的结构。如图1所示，液晶显示装置200包括背光模组100。而如图2所示，背光模组100包括背板15、导光板1、光源2、光学膜片3、反射片4和位置转换机构6。其中，该背光模组100为侧光式，也就是光源2设置在导光板1的侧面。导光板1设置在背板15内。为了使得光源2发出的光高效率地照射在液晶显示装置200的液晶玻璃20上，在导光板1的前表面覆有光学膜片3。而为了提高光源2的光的利用率，在导光板1的背表面设置有反射片4。根据本发明，通过位置转换机构6，能使光学膜片3和反射片4的位置互换，以使得光学膜片3位于导光板1的前表面和背表面处的一处，而反射片4位于导光板1的前表面和背表面处的另一处。
需要说明地是，前表面和背表面以液晶显示装置200的实际使用方位为参考。
由此，在光学膜片3处于导光板1的前表面，而反射片4处于导光板1的背表面的时候，光源2发出的光和经过反射片4反射的光最终由光学膜片3向前表面方向照射出去，为液晶显示装置200的液晶玻璃20供给高效率的光。然而，当光学膜片3和反射片4的位置在互换之后，也就是，光学膜片3处于导光板1的背表面，而反射片4处于导光板1的前表面的时候，光源2发出的光和经过反射片4反射的光最终由光学膜片3向背表面方向照射出去以用于日常照明，而不是为液晶玻璃20供给光线。优选地，光源2可为发光二极管(LED)。而由于LED作为光源的效率高、能耗低、颜色纯度高，从而通过这种方式供给的光可为理想的照明光，供用户在日常生活中使用。因此，该背光模组100不仅能为液晶玻璃20供给光，还能作为平常照明的光源使用，增加了背光模组100的使用范围，做到了一机多用。
根据本发明，光学膜片3的两侧和反射片4的两侧分别固定连接形成传动套5，也即是，光学膜片3和反射片4的首尾依次相连以形成套状的传动套5。位置转换机构6包括滚轮组件。滚轮组件用于驱动传动套5以实现光学膜片3和反射片4的位置互换。
滚轮组件包括支撑件7、支撑轴8和轴承9，如图7所示。其中，支撑件7构造为长条状，且其两端与背板15固定连接。在支撑件7的一侧边缘上设置有通常的圆孔10，并在与圆孔10的轴向垂直的方向上设置有槽11。支撑轴8能设置在圆孔10内。而轴承9能设置在槽11内，并固定在支撑轴8上。在使用过程中，传动套5能接触轴承9而绕滚轮组件运动。优选地，轴承9为多个，槽11的数量与轴承9的数量匹配，并且槽11的宽度和轴承9的宽度匹配。通过这种设置，支撑轴8被分解为多个较短的支撑轴，防止了由于跨度大而造成的支撑轴8容易弯曲的现象。同时，这种方式保证了光学膜片3和反射片4在位置互换传动过程中的平稳性。
在一个实施例中，轴承9的周向外壁上设置有柔性材料。优选地，柔性材料为橡胶、树脂或发泡塑料中的一种。通过这种设置，在轴承9与传动套5接触过程中，增大了传动套5与轴承9的摩擦力，保证了传动套5的传动速度和传动距离，从而确保了光学膜片3和反射片4 的转换位置的精确度。同时，由于设置在轴承9的外壁上的为柔性材料，避免了轴承9与传动套5直接接触而对传动套5造成过多的磨损，更好的保护了光学膜片3和反射片4。
为了保证运行的平稳性，在传动套5的两侧对称式设置位置转换机构6。即，在导光板1的两侧设置有对称分布的一对位置转换机构6。这种设置方式使得传动套5的运行更平稳，光学膜片3和反射片4的转换效率更高，如图1、3所示。
在实际生产过程中，光源2有可能对称式位于导光板1的两侧。在这种情况下，位置转换机构6可以设置在与光源2的入光侧相同的一侧，并且位置转换机构6相对于光源2远离导光板1，如图1、2所示。在这种设置方式中，由于传动套5需要绕过光源2，因此，可以设置有调整轮组件12，调整轮组件12设置在导光板1的背表面侧，并且位于靠近导光板1的入光侧，以用于限定传动套5的位置使其靠近导光板1并与导光板1的背表面平行。为简单起见，调整轮组件12可构造为固定连接在背板15上的旋转件。但是为了保证运行平稳，调整轮组件12还可构造为与滚轮组件相同的结构形式。关于调整轮组件12的具体结构，在此不再赘述。
在光源2对称式位于导光板1的两侧的情况下，位置转换机构6还可以设置在光源2的非入光侧，如图3、4所示。这种情况下，传动套5不用绕过光源2。并且，在这种情况下不必设置调整轮组件12，由此，简化了背光模组100的结构。同时，这种设置有利于背光模组100的薄型化。但是，实际生产过程中，光源2一般位于宽屏的液晶显示装置200的较短边的左右两侧，而不是较长边的上下两侧，从而，位置转换机构6设置在背光模组100的非入光侧会增加支撑轴8的长度，而由此提高生产成本。
如图5所示，背光模组100还包括设置在导光板1的背表面一侧的反射架13。反射架13与背板15固定连接，其包括与背板15所在的平面呈一定夹角的平板14。由此，如图6所示，通过光源2发出的光到达平板14后，经过平板14反射得到照明光(箭头表示光的方向)。需要说明地是，平板14与背板15所成的角度和安装位置可以根据对光的需求而变化。
为了保证光能由背板15内透射出来而到达平板14，背板15构造为框状，并在背板15处设置透光玻璃18，如图2所示。此透光玻璃18还起到了保护背板15的前侧的构件(例如，反射片4)的作用。
如图1、2所示，本发明涉及的液晶显示装置200还包括设置在背光模组100的前表面的液晶玻璃20。液晶玻璃20位于前框16和胶框17之间。这些结构和部件是本领域技术人员熟知的，在此不再进行赘述。
以上所述仅为本发明的优选实施方式，但本发明保护范围并不局限于此，任何本领域的技术人员在本发明公开的技术范围内，可容易地进行改变或变化，而这种改变或变化都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以权利要求书的保护范围为准。

Claims (18)

  1. 一种背光模组，所述背光模组为侧光式，其中，包括背板、设置在所述背板内的导光板、光学膜片、反射片和位置转换机构，其中，所述位置转换机构用于使所述光学膜片和所述反射片位置互换以使得所述光学膜片位于所述导光板的前表面和背表面处的一处而所述反射片位于所述导光板的前表面和背表面处的另一处。
  2. 根据权利要求1所述的背光模组，其中，位置转换机构包括与所述背板连接的滚轮组件，并且所述光学膜片的两侧和所述反射片的两侧分别固定连接形成传动套，所述传动套绕在所述滚轮组件上。
  3. 根据权利要求2所述的背光模组，其中，所述滚轮组件包括支撑件、支撑轴和轴承，所述支撑件固定设置在所述背板上，并且所述支撑件的远离所述导光板的一侧边缘上设置有通常的圆孔，并在与所述圆孔的轴向垂直的方向上设置有槽，所述支撑轴设置在所述圆孔内，所述轴承设置在所述槽内，并固定在所述支撑轴上。
  4. 根据权利要求3所述的背光模组，其中，所述轴承为多个，所述槽的数量与所述轴承的数量匹配，并且所述槽的宽度和所述轴承的宽度匹配。
  5. 根据权利要求3所述的背光模组，其中，所述轴承的周向外壁上设置有柔性材料。
  6. 根据权利要求2所述的背光模组，其中，在所述传动套的两侧对称式设置所述滚轮组件。
  7. 根据权利要求2所述的背光模组，其中，还包括设置在所述导光板的入光侧的光源，所述滚轮组件和所述光源依次远离所述导光板设置，并且，在与所述导光板的背表面侧设置用于调整所述传动套的位置的调整轮组件。
  8. 根据权利要求2所述的背光模组，其中，所述背板构造为框状，并在所述背板和所述导光板之间设置玻璃板。
  9. 根据权利要求8所述的背光模组，其中，在所述背板的背表面一侧设置有反射架。
  10. 一种液晶显示装置，其中，包括背光模组，所述背光模组为侧光式，并包括背板、设置在所述背板内的导光板、光学膜片、反射片和位置转换机构，其中，所述位置转换机构用于使所述光学膜片和所述反射片位置互换以使得所述光学膜片位于所述导光板的前表面和背表面处的一处而所述反射片位于所述导光板的前表面和背表面处的另一处。
  11. 根据权利要求10所述的液晶显示装置，其中，位置转换机构包括与所述背板连接的滚轮组件，并且所述光学膜片的两侧和所述反射片的两侧分别固定连接形成传动套，所述传动套绕在所述滚轮组件上。
  12. 根据权利要求11所述的液晶显示装置，其中，所述滚轮组件包括支撑件、支撑轴和轴承，所述支撑件固定设置在所述背板上，并且所述支撑件的远离所述导光板的一侧边缘上设置有通常的圆孔，并在与所述圆孔的轴向垂直的方向上设置有槽，所述支撑轴设置在所述圆孔内，所述轴承设置在所述槽内，并固定在所述支撑轴上。
  13. 根据权利要求12所述的液晶显示装置，其中，所述轴承为多个，所述槽的数量与所述轴承的数量匹配，并且所述槽的宽度和所述轴承的宽度匹配。
  14. 根据权利要求12所述的液晶显示装置，其中，所述轴承的周向外壁上设置有柔性材料。
  15. 根据权利要求11所述的液晶显示装置，其中，在所述传动套的两侧对称式设置所述滚轮组件。
  16. 根据权利要求11所述的液晶显示装置，其中，还包括设置在所述导光板的入光侧的光源，所述滚轮组件和所述光源依次远离所述导光板设置，并且，在与所述导光板的背表面侧设置用于调整所述传动套的位置的调整轮组件。
  17. 根据权利要求11所述的液晶显示装置，其中，所述背板构造为框状，并在所述背板和所述导光板之间设置玻璃板。
  18. 根据权利要求17所述的液晶显示装置，其中，在所述背板的背表面一侧设置有反射架。
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